Grinding-mill.



L. B. MOCARGAR.

GRINDING MILL.

APPLICATION FILED APB..24,1911.

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L. B. MQGARGAR.

GRINDING MILL.

APPLICATION FILED APR.24,1911.

1,002,419. Patented Sept. 5, 1911 r4 1 MMM 2 x1 MAW/MO Mme/13a cuLumnlA I'LANOGRAPH C0,,WASHINHTDN. n. c.

LORREN B. MGCARGAR, OF ST. JOSEPH, MISSOURI.

GRINDING-MILL.

Specification of Letters Patent.

Application filed April 24, 1911.

Patented Sept. 5, 1911. Serial No. 623,097.

To all whom it may concern:

Be it known that I, LORREN B. MCCAR- GAR, a citizen of the United States, residing at St. Joseph, in the county of Buchanan and State of Missouri, have invented certain new and useful Improvements in Grinding- Mills; and I do declare the following tobe a full, clear, and exact description of the invention such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to grinding mills especially adapted for grinding ear corn with the shuck on and Kafir corn and Milo maize in head, but which may also be used for grinding shelled corn or other grain without any change in the parts.

The object of the invention is to provide improved crushing and cutting devices by which the shuck, grains and cob are broken sufliciently to be fed to the grinding burs.

Another object is to provide improved means for so crushing the corn that it may be fed rapidly.

With these and other objects in view, the invention consists of certain novel features of construction, combination and arrangement of parts as will be more fully described and particularly pointed out in the appended claims.

In the accompanying drawings: Figure 1 represents a side elevation of a mill con structed in accordance with this invention; Fig. 2 is a vertical longitudinal section thereof; Fig. 3 is a detail side elevation of the crushing and cutting mechanism; Fig. 4 is a detail vertical section of the cutting and crushing mechanism with parts broken out; Fig. 5 is a bottom plan view of the upper movable cutter; Fig. 6 is a top plan view of the upper stationary cutter with the hopper shown in dotted lines; Fig. 7 is a bottom plan view of the lower movable cutter; Fig. 8 is a similar view of the lower stationary cutter; Fig. 9 is a transverse section taken on the line 9-9 of Fig. 5; Fig; 10 is a similar view taken on the line 1010 of Fig. 6; Fig. 11 is a similar view taken on the line 11-.1l of Fig. 8.

In the embodiment illustrated a base plate 1 is shown on which the mill is mounted. This mill may be of any suitable or desired construction, the novel features residing in the peculiar crushing and grinding means which will be hereinafter described.

This mill may be operated in any suitable manner, it being here shown provided with a driving wheel 3 mounted on a horizontally disposed shaft 4 provided with a cog wheel 5, which engages a crown gear 6, secured to the lower end of a vertically disposed revolubly mounted shaft 7 to which a bearing sleeve 8 is fixed, said sleeve preferably having an angular socket in its lower end which fits over a correspondingly shaped portion of the shaft 7. The cutting knives and grinding burs are mounted on said sleeve 8 and shaft 7 within a hopper 2.

The burs 8 may be of any suitable or desired construction and are mounted below the cutting and crushing knives as shown in Fig. 4. The angular socket 9 of the bearing 8 is engaged with a correspondingly shaped portion 7 of the shaft 7 to provide for the turning of said bearing with said shaft. This bearing 8 is provided on its outer face with alternately arranged round and angular portions as 10, 11, 12 and 13 to receive the rotary and stationary cutting knives to be described.

A horizontally disposed stationary knife 14 is arranged in the hopper 2 above the bur 8 and is constructed with an annular hub 15, the opening in which is circular and has a stepped face 16 for engaging the correspondingly shaped portion 13 at the lower end of the tubular bearing 8 to permit the turning of the shaft 7 relatively to said knife 14. This hub 15 has five curved blades as 17 the free ends of which are notched or recessed as shown at 18 to engage lugs as 2' on the inner face of the hopper 2 whereby said knife is held securely against turning. The sides of these blades 17 are hol lowed out as shown in Figs. 8 and 11 to form sharp cutting edges as 19 on the upper inner edges of said blades which form a shear for the revolving cutter 20 now to be described.

Arranged on the bearing 8 above the stationary knife 14 is the revoluble knife 20 having a plurality of radiating curved blades 21, three bein here shown and each provided with a cutting edge at its top and bottom which act in conjunction with the knives above and below it. The hub of this revoluble knife 20 has an angular opening 22 therein which fits over the angular portion 12 of the bearing 8 and thereby secures said knife to said bearing to provide for its turning with the bearing on the rotation of the shaft 7.

A stationary knife 23 is arranged on the round portion 11 of the bearing 8 above the knife 20, the opening therein being round to provide for the turning of the bearing without imparting motion to the knife. This knife is also provided with a plurality of radiating prongs or blades as 24 three being here shown and each provided with a cutting edge at its top and bottom as .is shown clearly in Fig. 10. The free ends of the arms or blades 24: are provided with notches or recesses as 25 which are adapted to engage lugs 2" secured to the inner face of the hopper 2 and which hold said knife securely against turning.

A top knife 26 has an angular openmg 27 therein which fits the angular portion 10 of the bearing 8 to provide for the revolution of'said knife with said bearing. This knife 26 is provided with two oppositely disposed blades 29 to provide sufiicient room for rapid feeding of the corn. These blades 29 are cut out on their lower faces as shown at 30 to provide for the passage through the slots 31 therein of the bolts 32 which securethe ends of a force feed 33 to said knife and permit nuts 32 to be secured to the ends of the bolts without projecting into the path of the cutting edge of said knife. These knives are constructed in cross section as shown in Fig. 9 with their upper faces curved as shown at 34 to provide the cutting edges 35 at the lower side thereof for cooperation with the cutting edges on the upper faces of the blades of the knife 23.

The force feed 33 is here shown in the form of two curved blades secured to and depending from a sleeve 36 through'which the shaft 7 loosely passes, said feed being rotated by means of the top cutting knife 26 to which it is secured. A nut 37 or any other suitable means are arranged on the shaft 7 above the sleeve 36 to retain the parts in operative position, jam nuts 38 being arranged on said shaft below said sleeve between it and the upper face of the knife 26.

A plurality of spirally disposed ribs as 39' are preferably arranged on the inner face of the hopper 2 which act as an auger in connection with the force feed to convey the corn to the knives.

In the operation of this improved mill the hopper is supplied with corn on the ear and preferably in the shuck, which is first engaged by the blades of the force feed 33 and fed thereby to the upper knife 26 which cuts the ears into large pieces and as these pieces approach the second knife 23 which has three blades they are ground a trifle finer and when they finally reach the lowermost knife 14, which is provided 'with five blades the corn, cob and shuck are ground to the size of a grain of corn and from thence it passes to the grmdm burs 8 and may there be ground to any desired fineness according to the adjustment of the burs. The knives and burs are constructed of chilled steel and may be resharpened when necessary.

From the foregoing description taken in connection with the accompanying. drawings, the construction and operation of the invention will be readily understood with out requiring a more extended explanation.

Various changes in the form, proportion and the minor details of construction may be-resorted to without departing from the principle or sacrificing any of the advantages of the invention as defined in the appended claims.

I claim as my invention:

1. A grinding mill provided with alternately arranged stationary and revoluble cutters, each having a plurality of radially extending cutting blades, the blades of said cutters gradually decreasing in number toward the upper end of the mill, whereby the material operated upon is gradually ground finer in its passage through the mill.

2. A grinding mill having a stationary lower cutter provided with radially extending cutting blades, a revoluble cutter arranged above said stationary cutter, a stationary cutter arranged above said revoluble cutter, and a revoluble cutter arranged above said last mentioned stationary cutter, each of said cutters having radially extending blades, the blades of each cutter increasing in number from the top toward the bottom of the mill.

3. A grinding mill having a stationary lower cutter provided with a plurality of radially extending curved cutting blades having sharpened upper edges, a revoluble cutter arranged above said stationary cutter and having sharpened edges on its upper and lower faces, a stationary cutter arranged above said revoluble cutter and having a plurality of radially extending curved blades with sharpened edges at their upper and lower faces and a revoluble cutter arranged above said last mentioned stationary cutter and having two oppositely extending witnesses.

LORREN B. MGCARGAR. Witnesses HORACE STRINGFELLOW,

M. M. MoCAnoAR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. G. 

